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Re: 2 channels do not work
Either the channels are blown or the fuzes for those channels are blown. Check all connections, as well as disconnect all coneections then reconnect. Hopefully you have a warranty for servicing or replacement.
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outputs also blown, go to ebay and buy a better amp form the same price you would have paid for pyle to fix that one, just keep playing with that one and you will get better at repairs, thats how i learned to fix amps.
You need to bridge 2 of the amp channels to each 4 ohm sub to get the most power from the amp. Bridge channels 1/2 to one of the subs and channels 3/4 to the other one. But the amp is only rated for 75 watts RMS per channel and Pyle products are sometimes rated higher than their real capabilities. So, even bridged and with the rated output, you'll only be getting at most 150 watts from a pair of bridged channels. That's not much for a sub.
I'm assuming you mean channels 2 and 4? If you tried new cables and you know they work then you might wanna check to see if there is a 2,3,or 4 channel switch on the amp or just a switch that reads bridged. If a switch on an amp is set to bridged or 2 channels, whatever type of switch there is, then it would make the amp only run 2 channels. If there is'nt a switch and you have a signal on the cable your using then you may have some shorted transistors. Make sure you definately have a signal first before thinking some transistors are shorted. Take the rca's from the 2 channels that work and put them into the inputs cause you know those channels are working. Let me know what you find, I would like to help you more if you still have problems after this. I also do amplifire repair cheap. I have my own business and most of my customers are from this site, so if you need it repaired then I can help you out on this as well. Just send me a private message. Good luck